Which game controllers can be used on a mac? Game: Colin McRae Dirt 2

I just bought this game, and love it. I have used one controller with the game: a Logitech MOMO Racing wheel (the one with all red buttons), and it works wonderfully. The only issue I have with it is that the game and wheel sometimes are out of calibration.

As for which controllers should work, any controller that works with Mac OS X should work with this game. I recommend something with variable inputs (i.e. not just buttons), because otherwise, why not just use the keyboard?

Hope this isn't too late to help.